수의 나나 값을 열당에서 팬더

코드 예제

2
0

을 찾을 수의 할머니는 열당 팬더

In [1]: s = pd.Series([1,2,3, np.nan, np.nan])

In [4]: s.isna().sum()   # or s.isnull().sum() for older pandas versions
Out[4]: 2

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